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Police investigating the shooting of three people, which left one dead, in Hamilton now want sightings of two vehicles seen in the area at the time.

Robert Nelson was shot dead while his girlfriend, Kahlee Marfell, was shot in the leg during the confrontation when three men stormed the Marshall Ave, Melville, house about 12.45am on July 8.

A 17-year-old was also critically injured after being shot four times in the hallway of the house in a shooting which the Herald understands was targeted at Marshall's senior Mongrel Mob father, Mark "Griff" Griffiths.

"Tonight on Police Ten 7 we will be releasing some details about two vehicles seen in the area around the time of this attack.

"I'm hopeful viewers will respond to our plea for more information about these vehicles as any information could be crucial to our investigation. We are determined to find those behind this attack and hold them to account for Mr Nelson's death and the other two victims' injuries."

Nelson was not connected to a gang and his family say he was trying to protect his partner after she was shot.